[mb-users] Double bass / contrabass vs. Acoustic upright bass

[Olivier]

Can an instrument tree guru clarify the difference between a double
bass and an acoustic upright bass?

I always thought they were the same thing...

Wacky has this:
http://en.wikipedia.org/wiki/Double_bass
that suggest they are synonyms.

And the first google hits for "acoustic upright bass" shows... double basses?
http://www.themusicmotel.com/gear_box/list.asp?catid=195&vid=475


Regards,

- Olivier